CN214150853U - Zinc oxide arrester live-line tester simple to operate - Google Patents
Zinc oxide arrester live-line tester simple to operate Download PDFInfo
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- CN214150853U CN214150853U CN202023026191.9U CN202023026191U CN214150853U CN 214150853 U CN214150853 U CN 214150853U CN 202023026191 U CN202023026191 U CN 202023026191U CN 214150853 U CN214150853 U CN 214150853U
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 238000012360 testing method Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009421 internal insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
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Abstract
The utility model provides an easy operation's electrified tester of zinc oxide arrester, through setting up first half-wave rectifier circuit, second half-wave rectifier circuit and constant current source circuit, first half-wave rectifier circuit and second half-wave rectifier circuit convert the alternating voltage signal rectification of the output of the I/V converting circuit into direct current voltage signal, and utilize constant current source circuit to make the conduction current of diode keep invariable in first half-wave rectifier circuit and the second half-wave rectifier circuit, eliminate the nonlinearity of diode and produce the distortion, thereby improve the detection precision of the electrified tester of zinc oxide arrester; through setting up low pass filter circuit, the circuit passband is flat, and the transition band is extremely narrow, can filter better with the higher frequency interference signal that stray interference signal and external noise and electromagnetic interference that the fundamental wave is more close brought, further improve the detection precision of zinc oxide arrester live tester.
Description
Technical Field
The utility model relates to a zinc oxide arrester detects technical field, especially relates to an easy operation's zinc oxide arrester live tester.
Background
Internal insulation can appear when the zinc oxide arrester is moving and defects such as wet and valve block ageing influence electric power safety production, need regularly carry out preventive test, confirm whether its operating condition is good, because zinc oxide arrester quantity increases gradually among the electric power system, the maintenance work load that has a power failure is more and more big, the maintenance that has a power failure is more and more difficult to carry out, along with the rapid development of electrified test, the use of the electrified tester of arrester is more and more frequent, present electrified tester of arrester in use has following shortcoming: at present, the lightning arrester live test is mainly based on two factors of system voltage and leakage current, and mainly comprises the steps of measuring the leakage current of the lightning arrester and the voltage of a corresponding phase, calculating a capacitive component and a resistive component, then judging the state of the zinc oxide lightning arrester, measuring the leakage current from a grounding lead of the zinc oxide lightning arrester, and obtaining a voltage signal from a metering terminal of a system voltage transformer.
At present, a current sensor is generally used for detecting leakage current of a zinc oxide arrester, because the leakage current is alternating current and the magnitude of an effective value is difficult to measure, a signal conditioning circuit is generally arranged for carrying out I/V conversion, filtering and rectification on the alternating current. The existing rectifying circuit usually adopts a full-wave rectifying and filtering circuit built by diodes, and the rectified output result of the full-wave rectifying and filtering circuit is distorted due to the nonlinearity of the diodes.
Therefore, in order to solve the problem, the utility model provides an easy operation's electrified tester of zinc oxide arrester through optimizing current full wave rectifier circuit's structure, avoids the result of output after the rectification can produce the distortion because of the nonlinearity of diode to improve the detection precision of the electrified tester of zinc oxide arrester.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an easy operation's electrified tester of zinc oxide arrester through optimizing current full wave rectifier circuit's structure, avoids the result of output after the rectification can produce the distortion because of the nonlinearity of diode to improve the detection precision of the electrified tester of zinc oxide arrester.
The technical scheme of the utility model is realized like this: the utility model provides an electrified tester of zinc oxide arrester with simple operation, which comprises a CPU chip, a current sensor and an I/V conversion circuit, and also comprises a first half-wave rectifying circuit, a second half-wave rectifying circuit and a constant current source circuit;
the current sensor collects leakage current at the grounding lead of the zinc oxide arrester, and current signals corresponding to the leakage current are input to the input end of the I/V conversion circuit, the output end of the I/V conversion circuit is respectively and electrically connected with the input end of the first half-wave rectification circuit and the input end of the second half-wave rectification circuit, the output end of the first half-wave rectification circuit and the output end of the second half-wave rectification circuit are both electrically connected with the analog input end of the CPU chip, and the output end of the constant current source circuit is respectively and electrically connected with the power supply end of the first half-wave rectification circuit and the power supply end of the second half-wave rectification circuit.
On the basis of the above technical solution, preferably, the first half-wave rectification circuit includes a resistor R1, a resistor R2, a diode D1, a diode D2, an NPN-type transistor Q1, and a first operational amplifier LM 358;
the output end of the I/V conversion circuit is electrically connected with the anode of the diode D1, one end of the resistor R2 and the inverting input end of the first operational amplifier LM358 through a resistor R1 respectively, the non-inverting input end of the first operational amplifier LM358 is grounded, the cathode of the diode D1 is electrically connected with the output end of the first operational amplifier LM358, the other end of the resistor R2 is electrically connected with the emitter of the NPN type triode Q1, the collector of the NPN type triode Q1 is electrically connected with the output end of the constant current source circuit, the base of the NPN type triode Q1 and the output end of the first operational amplifier LM358 are electrically connected with the anode of the diode D2, and the cathode of the diode D2 is electrically connected with the analog input end of the CPU chip.
Further preferably, the constant current source circuit includes a power supply, a resistor R3, an NPN transistor Q2, and an NPN transistor Q3;
the output end of the power supply is electrically connected with the collector of the NPN type triode Q1, the power supply end of the second half-wave rectification circuit and one end of the resistor R3 respectively, the other end of the resistor R3 is electrically connected with the collector of the NPN type triode Q3, the base of the NPN type triode Q2 respectively, the emitter of the NPN type triode Q2 and the emitter of the NPN type triode Q3 are both grounded, and the collector of the NPN type triode Q2 is electrically connected with the cathode of the diode D2 and the output end of the second half-wave rectification circuit respectively.
On the basis of the above technical solution, preferably, the apparatus further comprises a low-pass filter circuit;
the output end of the first half-wave rectification circuit and the output end of the second half-wave rectification circuit are both electrically connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is electrically connected with the analog input end of the CPU chip.
Still further preferably, the low-pass filter circuit has a cutoff frequency of 1 MHz.
Still more preferably, the low-pass filter circuit comprises a resistor R20, a resistor R21, an inductor L1, an inductor L2, and capacitors C1-C5;
the output end of the first half-wave rectifying circuit and the output end of the second half-wave rectifying circuit are respectively electrically connected with one end of a resistor R20, one end of a capacitor C1, one end of a capacitor C2 and one end of an inductor L1, the other end of the resistor R20 and the other end of the capacitor C1 are all grounded, the other end of a capacitor C2 is respectively electrically connected with the other end of an inductor L1, one end of an inductor L2, one end of a capacitor C3 and one end of the capacitor C4, the other end of the capacitor C3 is grounded, the other end of the capacitor C4 is respectively electrically connected with the other end of an inductor L2, one end of a capacitor C5, one end of a resistor R21 and the analog input end of the CPU chip, and the other ends of a capacitor C5 and a resistor R21 are all grounded.
On the basis of the technical scheme, the voltage transformer and the voltage detection module are preferably further included;
the voltage transformer collects the voltage on the zinc oxide arrester, and inputs an electric signal corresponding to the voltage to the CPU chip through the voltage detection module to be processed to obtain a voltage value.
The utility model discloses an easy operation's electrified tester of zinc oxide arrester has following beneficial effect for prior art:
(1) by arranging the first half-wave rectifying circuit, the second half-wave rectifying circuit and the constant current source circuit, the first half-wave rectifying circuit and the second half-wave rectifying circuit rectify and convert an alternating current voltage signal output by the I/V conversion circuit into a direct current voltage signal, and the constant current source circuit is utilized to keep the conduction current of diodes in the first half-wave rectifying circuit and the second half-wave rectifying circuit constant, so that the nonlinearity of the diodes is eliminated to generate distortion, and the detection precision of the zinc oxide arrester live tester is improved;
(2) through setting up low pass filter circuit, the circuit passband is flat, and the transition band is extremely narrow, can filter better with the higher frequency interference signal that stray interference signal and external noise and electromagnetic interference that the fundamental wave is more close brought, further improve the detection precision of zinc oxide arrester live tester.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system structure diagram of a zinc oxide arrester live tester with simple operation according to the present invention;
fig. 2 is a circuit diagram of a first half-wave rectifying circuit, a second half-wave rectifying circuit and a constant current source circuit in the zinc oxide arrester live-line tester with simple operation of the utility model;
fig. 3 is a circuit diagram of the low-pass filter circuit in the zinc oxide arrester live tester with simple operation of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in figure 1, the utility model discloses an easy operation's electrified tester of zinc oxide arrester, it includes CPU chip, voltage transformer, voltage detection module, current sensor, low pass filter circuit, IO converting circuit, first half-wave rectifier circuit, second half-wave rectifier circuit and constant current source circuit.
And the current sensor is used for collecting leakage current at the grounding lead of the zinc oxide arrester and inputting an alternating current signal corresponding to the leakage current into the I/V conversion circuit for processing. In the present embodiment, the improvement of the current sensor structure is not involved, and therefore, the circuit structure of the current sensor will not be described here. Preferably, the current sensor can be NB-DI1B0-A2 KD.
And the I/V conversion circuit converts an alternating current signal output by the current sensor into an alternating voltage signal, and inputs the alternating voltage signal into the first half-wave rectification circuit and the second half-wave rectification circuit for rectification. In this embodiment, the input terminal of the I/V conversion circuit receives the alternating current signal output by the current transformer, and the output terminal of the I/V conversion circuit is electrically connected to the input terminal of the first half-wave rectification circuit and the input terminal of the second half-wave rectification circuit, respectively. Preferably, the present embodiment does not involve an improvement in the structure of the I/V conversion circuit, and therefore, the structure of the I/V conversion circuit will not be described in detail herein.
Because the existing rectification circuit usually adopts a full-wave rectification filter circuit built by diodes, the rectified output result can be distorted due to the nonlinearity of the diodes. Therefore, in order to solve the above problems, the present embodiment provides a first half-wave rectifier circuit and a second half-wave rectifier circuit to rectify and convert an ac voltage signal output by the I/V conversion circuit into a dc voltage signal, and keeps the conduction current of the diodes in the first half-wave rectifier circuit and the second half-wave rectifier circuit constant by using a constant current source circuit, thereby eliminating the non-linear distortion of the diodes, and improving the detection accuracy of the zinc oxide arrester live tester; when the alternating current voltage signal output by the I/V conversion circuit is negative, at the moment, the second half-wave rectification circuit is cut off, the line between the constant current source circuit and the second half-wave rectification circuit is disconnected, the first half-wave rectification circuit is conducted, the line between the constant current source circuit and the first half-wave rectification circuit is conducted, and the constant current source circuit provides constant working voltage for the first half-wave rectification circuit, so that the nonlinear distortion of the diode is eliminated, the detection precision of the zinc oxide arrester live tester is improved, the first half-wave rectification circuit converts the negative alternating current voltage signal into a stable positive direct current signal, and the positive direct current signal is input to the low-pass filter circuit; when the alternating current voltage signal output by the I/V conversion circuit is positive, at the moment, the first half-wave rectification circuit is cut off, the line between the constant current source circuit and the first half-wave rectification circuit is disconnected, the second half-wave rectification circuit is connected, the line between the constant current source circuit and the second half-wave rectification circuit is connected, and the constant current source circuit provides constant working voltage for the second half-wave rectification circuit, so that the nonlinearity distortion of a diode is eliminated, the detection precision of the zinc oxide arrester electrification tester is improved, the forward alternating current voltage signal is converted into a stable forward direct current signal by the second half-wave rectification circuit, and the forward direct current signal is input to the low-pass filter circuit. In this embodiment, the input terminal of the first half-wave rectifier circuit and the input terminal of the second half-wave rectifier circuit are both electrically connected to the output terminal of the I/V conversion circuit, the output terminal of the first half-wave rectifier circuit and the output terminal of the second half-wave rectifier circuit are both electrically connected to the input terminal of the low-pass filter circuit, and the output terminal of the constant current source circuit is respectively electrically connected to the power supply terminal of the first half-wave rectifier circuit and the power supply terminal of the second half-wave rectifier circuit.
Preferably, in this embodiment, the first half-wave rectifier circuit and the second half-wave rectifier circuit have the same circuit configuration and operation principle, and therefore, the configuration of the second half-wave rectifier circuit is not described in detail herein, and only the first half-wave rectifier circuit will be described. Preferably, in this embodiment, as shown in fig. 2, the first half-wave rectification circuit includes a resistor R1, a resistor R2, a diode D1, a diode D2, an NPN-type transistor Q1, and a first operational amplifier LM 358; specifically, the output end of the I/V conversion circuit is electrically connected to the anode of the diode D1, one end of the resistor R2 and the inverting input end of the first operational amplifier LM358 through a resistor R1, the non-inverting input end of the first operational amplifier LM358 is grounded, the cathode of the diode D1 is electrically connected to the output end of the first operational amplifier LM358, the other end of the resistor R2 is electrically connected to the emitter of the NPN type triode Q1, the collector of the NPN type triode Q1 is electrically connected to the output end of the constant current source circuit, the base of the NPN type triode Q1 and the output end of the first operational amplifier LM are both electrically connected to the anode of the diode D2, and the cathode of the diode D2 is electrically connected to the input end of the low pass filter circuit. As shown in fig. 2, Vi denotes an alternating voltage signal output from the I/V conversion circuit; u1 denotes a first operational amplifier LM 358; vo1 represents a forward direct current voltage signal output from the first half-wave rectifier circuit or the second half-wave rectifier circuit; the collector of the NPN transistor Q1 is the power supply terminal of the first half-wave rectifier circuit.
The resistor R1 is a current-limiting resistor for preventing the voltage signal output by the I/V conversion circuit from breaking through the first operational amplifier LM358 too much; the resistor R2 is a degeneration resistor for reducing the nonlinear distortion of the first operational amplifier LM 358; the NPN type triode Q1 is a switch, when the alternating voltage signal output by the I/V conversion circuit is negative, the first operational amplifier LM358 outputs a forward alternating voltage signal, at the moment, the diode D1 is cut off, the diode D2 is conducted, the NPN type triode Q1 is conducted, the output voltage of the constant current source circuit is input to the diode D2 through the conducted NPN type triode Q1 to provide constant working voltage for the diode D2, and the diode D2 outputs a stable forward direct current signal to the low-pass filter circuit, so that the nonlinear distortion generated by the diode D2 is eliminated, and the detection accuracy of the zinc oxide arrester live tester is improved; when the alternating voltage signal output by the I/V conversion circuit is positive, the first operational amplifier LM358 outputs a negative alternating voltage signal, at this time, the diode D1 is turned on, the diode D2 is turned off, the NPN-type transistor Q1 is turned off, the line between the constant current source circuit and the NPN-type transistor Q1 is disconnected, and the diode D2 does not output.
Preferably, in this embodiment, as shown in fig. 2, the constant current source circuit includes a power supply, a resistor R3, an NPN transistor Q2, and an NPN transistor Q3; specifically, the output end of the power supply is electrically connected to the collector of the NPN transistor Q1, the power supply end of the second half-wave rectifier circuit, and one end of the resistor R3, the other end of the resistor R3 is electrically connected to the collector of the NPN transistor Q3, the base of the NPN transistor Q2, the emitter of the NPN transistor Q2 and the emitter of the NPN transistor Q3 are both grounded, and the collector of the NPN transistor Q2 is electrically connected to the cathode of the diode D2 and the output end of the second half-wave rectifier circuit. As shown in fig. 2, VCC denotes a power supply; the output end of the power supply is the output end of the constant current source circuit. The NPN type triode Q2 and the NPN type triode Q3 are integrated differential pair triodes, and the characteristics of the NPN type triode Q2 and the characteristics of the NPN type triode Q3 are completely symmetrical; the NPN type triode Q2 is enabled to work in a constant current area all the time by a power supply, the conduction current of the diode D2 is enabled to be kept constant, and therefore the output result after rectification is kept linear, the problem that the output result after rectification is distorted due to the nonlinearity of the diode when the existing rectification circuit is a full-wave rectification filter circuit built by the diode is solved, and the detection precision of the zinc oxide arrester live tester is improved.
The low-pass filter circuit filters high-frequency interference signals caused by external noise and electromagnetic interference in the forward direct-current voltage signals, and the detection precision of the zinc oxide arrester live-line tester is further improved. In this embodiment, an input terminal of the low-pass filter circuit is electrically connected to an output terminal of the first half-wave rectifier circuit and an output terminal of the second half-wave rectifier circuit, respectively, and an output terminal of the low-pass filter circuit is electrically connected to an analog input terminal of the CPU chip. Preferably, in this embodiment, the low-pass filter circuit includes a resistor R20, a resistor R21, an inductor L1, an inductor L2, and capacitors C1-C5; specifically, the output end of the first half-wave rectifier circuit and the output end of the second half-wave rectifier circuit are electrically connected with one end of a resistor R20, one end of a capacitor C1, one end of a capacitor C2 and one end of an inductor L1, the other end of the resistor R20 and the other end of the capacitor C1 are all grounded, the other end of a capacitor C2 is electrically connected with the other end of an inductor L1, one end of an inductor L2, one end of a capacitor C3 and one end of a capacitor C4, the other end of a capacitor C3 is grounded, the other end of the capacitor C4 is electrically connected with the other end of an inductor L2, one end of a capacitor C5, one end of a resistor R21 and the analog input end of the CPU chip, and the other ends of a capacitor C5 and a resistor R21 are all grounded. As shown in fig. 3, Vo _ P1.1 represents the output forward dc voltage signal after the filtering process of the low-pass filter circuit.
The resistor R20, the capacitor C1, the inductor L1, the capacitor C2, the inductor L2, the capacitor C4, the inductor L1, the inductor L2, the capacitor C3, the capacitor C5 and the resistor R21 form a five-order elliptic filter circuit, compared with the existing filter circuit, the five-order elliptic filter circuit is flat in passband and extremely narrow in transition band, stray interference signals, external noise and high-frequency interference signals brought by electromagnetic interference which are closer to a fundamental wave can be better filtered, and the detection accuracy of the zinc oxide arrester live-line tester is further improved; since the frequency of a high-frequency interference signal due to external noise and electromagnetic interference is concentrated at 1MHz or more, the cutoff frequency of the low-pass filter circuit is set to 1 MHz.
The voltage transformer collects the voltage on the zinc oxide arrester, and inputs an electric signal corresponding to the voltage to the CPU chip through the voltage detection module to be processed to obtain a voltage value. In this embodiment, the structure of the voltage transformer and the voltage detection module is not improved, and therefore, the circuit structures of the voltage transformer and the voltage detection module are not described in detail herein. Preferably, JDZ (X) -3, 6 and 10 can be used as the voltage transformer.
And the CPU chip receives the voltage signal output by the low-pass filter circuit and the voltage signal output by the voltage detection module, and obtains capacitive components and resistive components of the zinc oxide arrester according to the two voltage signals. In this embodiment, the algorithm for calculating the capacitive component and the resistive component of the CPU chip is not improved, and the structure thereof is not improved, so that the internal algorithm and the structure thereof of the CPU chip are not described in detail herein. Preferably, the CPU chip can be CC 2530; wherein the P1.1 end correspondingly represents an analog input end connected with the low-pass filter circuit; wherein the end P1.2 correspondingly represents an analog input end connected with the voltage detection module.
The utility model discloses a theory of operation is: the current sensor collects leakage current at the grounding lead of the zinc oxide arrester, and inputs an alternating current signal corresponding to the leakage current to the I/V conversion circuit, the I/V conversion circuit converts the alternating current signal into an alternating voltage signal, and inputs the alternating voltage signal to the first half-wave rectification circuit and the second half-wave rectification circuit for rectification, when the alternating voltage signal output by the I/V conversion circuit is negative, the second half-wave rectification circuit is cut off, the line between the constant current source circuit and the second half-wave rectification circuit is disconnected, the first half-wave rectification circuit is connected, the line between the constant current source circuit and the first half-wave rectification circuit is connected, the constant current source circuit provides constant working voltage for the first half-wave rectification circuit, and the first half-wave rectification circuit converts the negative alternating voltage signal into a stable positive direct current signal, and the positive direct current signal is input to a low-pass filter circuit; when the alternating current voltage signal output by the I/V conversion circuit is positive, at the moment, the first half-wave rectification circuit is cut off, the line between the constant current source circuit and the first half-wave rectification circuit is disconnected, the second half-wave rectification circuit is connected, the line between the constant current source circuit and the second half-wave rectification circuit is connected, the constant current source circuit provides constant working voltage for the second half-wave rectification circuit, the second half-wave rectification circuit converts the forward alternating current voltage signal into a stable forward direct current signal, and the forward direct current signal is input to the low-pass filter circuit; a low-pass filter circuit filters out high-frequency interference signals brought by external noise and electromagnetic interference in the forward direct-current voltage signals, and the direct-current voltage signals after filtering processing are input to a CPU chip to be processed to obtain corresponding leakage current values; meanwhile, the voltage detection module collects the voltage of a metering terminal of a system voltage transformer and inputs an electric signal corresponding to the voltage to the CPU chip for processing to obtain a voltage value; and finally, obtaining capacitive components and resistive components of the zinc oxide arrester by the CPU chip according to the leakage current and the voltage value.
The beneficial effect of this embodiment does: by arranging the first half-wave rectifying circuit, the second half-wave rectifying circuit and the constant current source circuit, the first half-wave rectifying circuit and the second half-wave rectifying circuit rectify and convert an alternating current voltage signal output by the I/V conversion circuit into a direct current voltage signal, and the constant current source circuit is utilized to keep the conduction current of diodes in the first half-wave rectifying circuit and the second half-wave rectifying circuit constant, so that the nonlinearity of the diodes is eliminated to generate distortion, and the detection precision of the zinc oxide arrester live tester is improved;
through setting up low pass filter circuit, the circuit passband is flat, and the transition band is extremely narrow, can filter better with the higher frequency interference signal that stray interference signal and external noise and electromagnetic interference that the fundamental wave is more close brought, further improve the detection precision of zinc oxide arrester live tester.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an easy operation's zinc oxide arrester live tester, its includes CPU chip, current sensor and I/V converting circuit, its characterized in that: the rectifier circuit also comprises a first half-wave rectifier circuit, a second half-wave rectifier circuit and a constant current source circuit;
the current sensor collects leakage current at the grounding lead of the zinc oxide arrester, and inputs a current signal corresponding to the leakage current to the input end of the I/V conversion circuit, the output end of the I/V conversion circuit is electrically connected with the input end of the first half-wave rectification circuit and the input end of the second half-wave rectification circuit respectively, the output end of the first half-wave rectification circuit and the output end of the second half-wave rectification circuit are both electrically connected with the analog input end of the CPU chip, and the output end of the constant current source circuit is electrically connected with the power supply end of the first half-wave rectification circuit and the power supply end of the second half-wave rectification circuit respectively.
2. The zinc oxide arrester electrification testing instrument which is simple to operate as claimed in claim 1, is characterized in that: the first half-wave rectifying circuit comprises a resistor R1, a resistor R2, a diode D1, a diode D2, an NPN type triode Q1 and a first operational amplifier LM 358;
the output end of the I/V conversion circuit is electrically connected with the anode of the diode D1, one end of the resistor R2 and the inverting input end of the first operational amplifier LM358 through a resistor R1 respectively, the non-inverting input end of the first operational amplifier LM358 is grounded, the cathode of the diode D1 is electrically connected with the output end of the first operational amplifier LM358, the other end of the resistor R2 is electrically connected with the emitter of the NPN type triode Q1, the collector of the NPN type triode Q1 is electrically connected with the output end of the constant current source circuit, the base of the NPN type triode Q1 and the output end of the first operational amplifier LM358 are electrically connected with the anode of the diode D2, and the cathode of the diode D2 is electrically connected with the analog input end of the CPU chip.
3. The zinc oxide arrester electrification testing instrument which is simple to operate as claimed in claim 2, characterized in that: the constant current source circuit comprises a power supply, a resistor R3, an NPN type triode Q2 and an NPN type triode Q3;
the output end of the power supply is electrically connected with the collector of the NPN type triode Q1, the power supply end of the second half-wave rectification circuit and one end of the resistor R3 respectively, the other end of the resistor R3 is electrically connected with the collector of the NPN type triode Q3, the base of the NPN type triode Q2 respectively, the emitter of the NPN type triode Q2 and the emitter of the NPN type triode Q3 are both grounded, and the collector of the NPN type triode Q2 is electrically connected with the cathode of the diode D2 and the output end of the second half-wave rectification circuit respectively.
4. The zinc oxide arrester electrification testing instrument which is simple to operate as claimed in claim 1, is characterized in that: the low-pass filter circuit is also included;
the output end of the first half-wave rectification circuit and the output end of the second half-wave rectification circuit are both electrically connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is electrically connected with the analog input end of the CPU chip.
5. The zinc oxide arrester electrification testing instrument which is simple to operate as claimed in claim 4, is characterized in that: the cut-off frequency of the low-pass filter circuit is 1 MHz.
6. The zinc oxide arrester electrification testing instrument which is simple to operate as claimed in claim 4, is characterized in that: the low-pass filter circuit comprises a resistor R20, a resistor R21, an inductor L1, an inductor L2 and capacitors C1-C5;
the output end of the first half-wave rectifying circuit and the output end of the second half-wave rectifying circuit are respectively electrically connected with one end of a resistor R20, one end of a capacitor C1, one end of a capacitor C2 and one end of an inductor L1, the other end of the resistor R20 and the other end of the capacitor C1 are grounded, the other end of a capacitor C2 is respectively electrically connected with the other end of an inductor L1, one end of an inductor L2, one end of a capacitor C3 and one end of the capacitor C4, the other end of the capacitor C3 is grounded, the other end of the capacitor C4 is respectively electrically connected with the other end of an inductor L2, one end of a capacitor C5, one end of a resistor R21 and the analog input end of the CPU chip, and the other ends of a capacitor C5 and the resistor R21 are grounded.
7. The zinc oxide arrester electrification testing instrument which is simple to operate as claimed in claim 1, is characterized in that: the device also comprises a voltage transformer and a voltage detection module;
the voltage transformer collects the voltage on the zinc oxide arrester, and inputs an electric signal corresponding to the voltage to the CPU chip through the voltage detection module to be processed to obtain a voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023026191.9U CN214150853U (en) | 2020-12-15 | 2020-12-15 | Zinc oxide arrester live-line tester simple to operate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023026191.9U CN214150853U (en) | 2020-12-15 | 2020-12-15 | Zinc oxide arrester live-line tester simple to operate |
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| CN214150853U true CN214150853U (en) | 2021-09-07 |
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| CN202023026191.9U Expired - Fee Related CN214150853U (en) | 2020-12-15 | 2020-12-15 | Zinc oxide arrester live-line tester simple to operate |
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| CN (1) | CN214150853U (en) |
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2020
- 2020-12-15 CN CN202023026191.9U patent/CN214150853U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |